Medium large transport crew missed an ATC assigned crossing altitude.

Attributes
ACN	453910
Time
Date	199911
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	navaid : lvz.vortac
State Reference	PA
Altitude	msl bound lower : 18000 msl bound upper : 26000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zny.artcc
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Operating Under FAR Part	Part 121
Flight Phase	cruise : level descent : vacating altitude
Route In Use	arrival other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : cfi pilot : flight engineer pilot : multi engine pilot : atp
Experience	flight time last 90 days : 240 flight time total : 16500 flight time type : 11000
ASRS Report	463910
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : crossing restriction not met non adherence : far non adherence : published procedure
Independent Detector	other controllera
Resolutory Action	controller : issued alert flight crew : returned to original clearance flight crew : returned to assigned altitude
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance

Narrative:

From mht-phl, nyc told us to cross 15 mi north of luz at FL180. Cruising at FL260 I responded, 'understand 15 mi north of luz at FL180, concur please.' she said, 'that's correct.' at 65 mi from luz, nyc called us and said, 'verify 50 mi north of luz at FL180.' I told her, 'you gave us 15 mi north at FL180.' so we descended as fast as we could to make the restr. The problem arose when she did not use the correct phraseology of 'five zero' instead of 50. I heard 15 mi -- not five zero.

Original NASA ASRS Text

Title: MLG CREW MISSED AN ATC ASSIGNED XING ALT.

Narrative: FROM MHT-PHL, NYC TOLD US TO CROSS 15 MI N OF LUZ AT FL180. CRUISING AT FL260 I RESPONDED, 'UNDERSTAND 15 MI N OF LUZ AT FL180, CONCUR PLEASE.' SHE SAID, 'THAT'S CORRECT.' AT 65 MI FROM LUZ, NYC CALLED US AND SAID, 'VERIFY 50 MI N OF LUZ AT FL180.' I TOLD HER, 'YOU GAVE US 15 MI N AT FL180.' SO WE DSNDED AS FAST AS WE COULD TO MAKE THE RESTR. THE PROB AROSE WHEN SHE DID NOT USE THE CORRECT PHRASEOLOGY OF 'FIVE ZERO' INSTEAD OF 50. I HEARD 15 MI -- NOT FIVE ZERO.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.